1. What parameters are reported by the WIVIS-DSP?
The WIVIS-DSP reports present weather type, visibility, and ambient light level.
2. How does the WIVIS-DSP report present weather?
The WIVS-DSP reports present weather in NWS or WMO weather code formats as selected by the user.
3. Does the WIVIS-DSP report meteorological optical range (MOR)?
All OSI WIVIS and visibility sensors use Koschmieder’s Law to calculate MOR. MOR is reported as visibility.
4. What special calibration equipment is necessary for field calibration of the WIVIS-DSP?
The WIVIS-DSP uses artificial intelligence, fuzzy logic, and advance algorithms to self calibrate. Field calibration is not required.
5. I have heard that present weather sensors cannot correctly identify hail and ice pellets. Is this correct?}
Distinguishing hail and ice pellets from liquid precipitation has historically been difficult for present weather sensors. However, OSI patented Hail and Ice Pellet Sensor (HIPS) now reliably identifies hail and ice pellets. HIPS is available as a plug-in option to the WIVIS-DSP. If you are installing the WIVIS-DSP, in an area where hail and ice pellet identification is of concern, simply specify the HIPS option when ordering the WIVIS-DSP.
6. What are the power requirements of the WIVIS-DSP?
The WIVIS-DSP has been designed to allow system integrators to easily add the sensor to their system. 10 – 15 VDC @ 3 amps nominal is all that is required. The optional HIPS sensor does require AC power.
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7. How do I select a site for the installation of the WIVIS-DSP?
In general, OSI recommends that the siting of the sensor follows the guidelines established by The Federal Standard for Siting Meteorological Sensors at Airports, OFCM document #FCM-S4-1987. Additional guidance is included in the WIVIS-DSP User’s Guide; or contact OSI Customer Service.
8. At what height should the WIVIS-DSP be mounted?
Present weather and visibility sensors are commonly mounted at a height of 3 meters. Mounting the WIVIS-DSP lower than 2 meters or higher than 5 meters is not recommended.
9. What size pipe will the WIVIS-DSP mount to?
The WIVIS-DSP will mount to any pipe up to 2 inches (50 mm) in diameter. Schedule 40, galvanized, 1½ inch (2 inch OD), steel pipe is commonly used for this purpose.
10. What is the maximum recommended distance between WIVIS and PC?
If high quality data cable is used distances of 100 feet should not be a problem. It is recommended that some type of surge suppression is used on the PC serial port to protect the PC from voltage transients. The WIVIS-DSP normally does not require additional transient protection.
For distances greater than 100 feet (up to 9 miles or more) limited distance modems (LDM’s) may be used. Contact OSI Customer Service for more information.
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11. Is WIVIS-DSP PC data and display software available?
Yes. Order OSI QwikCollect software.
to order: Contact OSI Sales Dept.
12. How will window contamination effect the performance of the sensor?
The WIVIS-DSP is an extremely low maintenance sensor. The advanced window contamination algorithm will self correct for a high level of window contamination. Cleaning the exterior optical surfaces on a 90 to 180 day basis should give satisfactory performance even in an extremely dirty environment. Prior to window contamination being at a level which compromises sensor performance, a status bit will be set alerting the user that the sensor windows need to be cleaned.
Windows are cleaned by spraying a quality glass cleaner on the window surface and gently wiping with a soft cloth. Wipe carefully and gently to avoid scratching the optical surfaces.
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